JP5558267B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a structure in which a liquid crystal panel of a liquid crystal display device is supported by a frame.

  The liquid crystal display device has a liquid crystal panel and a frame surrounding the edge of the liquid crystal panel (for example, Patent Document 1 below). In a liquid crystal display device used as a television (TV) or the like, the liquid crystal panel is supported with its display surface facing forward, and the lower edge of the liquid crystal panel is a support portion formed on the lower side of the frame. It is put on.

JP-A-2005-275103

  A liquid crystal panel used in a TV or the like is assembled to a frame to form a display module. At this time, an IPS (In-Plane-Switching) type liquid crystal panel cannot be assembled in close contact with the frame due to its characteristics. This is because, when the liquid crystal panel is assembled to the frame, if uneven stress is applied to the liquid crystal panel, color unevenness is caused. In many cases, the liquid crystal panel has a slight warp. Therefore, the width of the support portion of the frame needs to be slightly larger than the thickness of the liquid crystal panel so that the warped liquid crystal panel can be placed on the support portion of the frame without applying stress.

  However, in such a structure, when the lowermost part of the panel surface (particularly the left and right ends) is pressed, the liquid crystal panel is distorted and the lower edge of the liquid crystal panel moves relative to the support part. At that time, stress is applied to the liquid crystal panel, resulting in uneven color on the display surface. In this case, if the lower edge of the liquid crystal panel can be returned when the pressing is released, the color unevenness is eliminated.

  However, in recent years, liquid crystal panels for TV have been increased in size, and the weight of large liquid crystal panels tends to increase. Therefore, the frictional force between the support portion of the frame and the liquid crystal panel is increased by the weight of the liquid crystal panel. . For this reason, when the lowermost part of the panel surface is pressed, the lower edge of the liquid crystal panel may not be returned due to being caught by the support portion of the frame, and in this case, uneven color remains.

  The present invention has been made in view of the above problems, and an object thereof is to provide a liquid crystal display device capable of suppressing the occurrence of color unevenness due to distortion of a liquid crystal panel.

  In order to solve the above problems, a liquid crystal display device according to the present invention includes a liquid crystal panel and a frame surrounding an edge of the liquid crystal panel. The lower side portion of the frame includes a support portion on which a lower edge of the liquid crystal panel is placed. The support portion has a width larger than the thickness of the liquid crystal panel, and the lower edge of the liquid crystal panel is an upper surface of the support portion. Is pasted.

  According to the present invention, it is possible to suppress the lower edge of the liquid crystal panel from moving relative to the upper surface of the support portion when the lowermost part of the surface of the liquid crystal panel is pressed. As a result, it is possible to prevent a situation in which the lower edge is caught by the support portion due to the frictional force and does not return, and the occurrence of uneven color due to the distortion of the liquid crystal panel can be suppressed.

  In one aspect of the present invention, an adhesive surface may be provided on the support portion, and the lower edge of the liquid crystal panel may be disposed on the adhesive surface. According to this aspect, the liquid crystal panel can be easily attached to the support portion.

  Further, in this aspect, the frame has a plurality of support portions that are positioned apart from each other in the direction along the lower edge of the liquid crystal panel as the support portion, and the adhesive surface is formed of the plurality of support portions. Each may be provided. This makes it possible to more firmly regulate the movement of the lower edge of the liquid crystal panel.

  Moreover, in another aspect of the present invention, the lower edge of the liquid crystal panel may be attached to the upper surface of the support portion via an attachment member disposed on the support portion. The mounting member has a first surface that adheres to the liquid crystal panel and a second surface that adheres to the support portion, and allows a positional deviation between the first surface and the second surface. Alternatively, it may be formed of a flexible material. By doing so, when the liquid crystal panel is deformed by heat generated by the use of the liquid crystal display device, the deformation is easily tolerated, and the occurrence of stress on the liquid crystal panel can be suppressed. As a result, even when the liquid crystal panel is slightly deformed by heat, the occurrence of color unevenness can be suppressed.

  In another aspect of the present invention, a liquid crystal display device includes a liquid crystal panel and a frame surrounding an edge of the liquid crystal panel. The lower side portion of the frame includes a support portion on which a lower edge of the liquid crystal panel is placed. The support portion has a width larger than the thickness of the liquid crystal panel, and the lower edge of the liquid crystal panel is above the support portion. It arrange | positions on the said upper surface of the said support part via the attachment member arrange | positioned in (3). The attachment member includes an elastic body having flexibility and an adhesive surface that adheres to the support portion. According to this aspect, since the lower edge of the liquid crystal panel can be disposed so as to sink into the mounting member, when the lowermost part of the surface of the liquid crystal panel is pressed, the lower edge of the liquid crystal panel is against the upper surface of the support portion. It can regulate movement. Even if the liquid crystal panel is slightly displaced, the liquid crystal panel can be returned to the original position by the elastic force of the elastic body.

It is a figure which faces the cross section of the lowest part of the liquid crystal display device which concerns on one Embodiment of this invention from diagonally. 2 is an exploded perspective view of a liquid crystal panel, a support frame, and a front frame included in the liquid crystal display device. FIG. FIG. 3 is a front view of a part of the support frame and the liquid crystal panel, in which the lower right portion of the support frame and the liquid crystal panel is shown enlarged. It is a cross section of the lowest part of the liquid crystal display device which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view of a lowermost section of a liquid crystal display device 1 which is an example of an embodiment of the present invention, obliquely viewed. FIG. 2 is an exploded perspective view of the liquid crystal panel 2, the support frame 4, and the front frame 5 included in the liquid crystal display device 1. FIG. 3 is a front view of a part of the support frame 4 and the liquid crystal panel 2. In FIG. 3, the lower right portion of the support frame 4 and the liquid crystal panel 2 is shown enlarged.

  As shown in FIG. 1, the liquid crystal display device 1 has a liquid crystal panel 2. The liquid crystal panel 2 has a rectangular shape as shown in FIG. The liquid crystal display device 1 supports the liquid crystal panel 2 in an upright state so that the display surface (front surface) faces forward. The liquid crystal display device 1 is, for example, a television display device.

  The liquid crystal panel 2 has a pair of substrates (specifically, glass substrates) 21 having optical transparency. One substrate 21 is a TFT substrate on which a TFT (Thin Film Transistor) is formed, and the other substrate 21 is formed with a color filter. The two substrates 21 are arranged to face each other with a slight gap. A liquid crystal 22 is sealed between the two substrates 21. The liquid crystal 22 in this example is driven by an IPS (In-Plane-Switching) method. The liquid crystal panel 2 further includes two polarizing filters 23 that are spaced apart from each other. The pair of substrates 21 is located between the two polarizing filters 23, and the polarizing filters 23 are respectively attached to the surface of the substrate 21. Note that the vertical width of the polarizing filter 23 is smaller than the vertical width of the substrate 21, and the lowermost portion of the substrate 21 is located below the lower edge of the polarizing filter 23.

  As shown in FIG. 1, the liquid crystal display device 1 includes a backlight unit 3 that is disposed on the back side of the liquid crystal panel 2 and applies light to the liquid crystal panel 2. The backlight unit 3 includes a reflection sheet 31 that reflects light from a light source (not shown) to the liquid crystal panel 2, a diffusion plate 32 that diffuses light from the light source and light reflected by the reflection sheet 31, an optical sheet 33, A lower frame 34 that holds the light source and the reflection sheet 31 is provided.

  Further, the liquid crystal display device 1 includes a square support frame 4 and a front frame 5 having a size corresponding to the outer periphery of the liquid crystal panel 2 as shown in FIG. 1 or FIG. The support frame 4 and the front frame 5 are combined with each other in the thickness direction of the liquid crystal panel 2 and surround the outer peripheral edge of the liquid crystal panel 2. In addition, the support frame 4 is shape | molded, for example with resin.

  As shown in FIG. 1 or FIG. 3, the support frame 4 has a lower side portion 41. The lower side portion 41 is located along the lower edge (lower edge of the pair of substrates 21) 2a of the liquid crystal panel 2 and extends from one end portion of the lower edge 2a to the other end portion. The lower side portion 41 has a rear wall portion 41a and a support portion 41b. The rear wall portion 41 a is formed along the back surface of the liquid crystal panel 2. That is, one surface of the rear wall portion 41 a and the back surface of the liquid crystal panel 2 face each other in the thickness direction of the liquid crystal panel 2. The support portion 41b is formed so as to protrude forward from the rear wall portion 41a (see FIG. 2), and its upper surface faces the lower edge (lower end surface) 2a of the liquid crystal panel 2 in the vertical direction.

  As shown in FIG. 1 or FIG. 3, the lower edge 2a of the liquid crystal panel 2 is placed on a support portion 41b and supported by the support portion 41b. The upper surface of the support portion 41b is elongated in the direction along the lower edge of the liquid crystal panel 2 (left-right direction (direction indicated by X1-X2)) and is formed horizontally. Further, as shown in FIG. 3, the support portion 41b is formed only in the vicinity of the end portion of the lower edge 2a of the liquid crystal panel 2. Although not shown in FIG. 3, a support portion 41 b is also formed at the end portion on the opposite side of the lower edge 2 a of the liquid crystal panel 2. In addition, the upper surface of the support part 41b may not be horizontal. For example, the upper surface of the support portion 41b may be curved so as to swell upward. By doing so, the contact area between the support portion 41b and the lower edge 2a of the liquid crystal panel 2 can be reduced.

  The lower side portion 41 has a plurality of (here, two) support portions 41b that are spaced apart from each other in the left-right direction, and the lower edge 2a of the liquid crystal panel 2 is partially supported by the support portion 41b. In this example, the two support portions 41b are provided at both ends of the lower side portion 41 and support the right end and the left end of the lower edge 2a of the liquid crystal panel 2, respectively. The lower edge 2a of the liquid crystal panel 2 is supported only by these two support portions 41b. In other words, the portion between the two support portions 41 b does not hit the lower edge 2 a of the liquid crystal panel 2.

  As shown in FIG. 2 or FIG. 3, the support frame 4 further includes an upper side portion 42, a right side portion 43, and a left side portion 44 that are positioned along the upper edge, right edge, and left edge of the liquid crystal panel 2. Each of these side portions 42, 43, 44 has a rear wall portion 4a. The rear wall portion 4 a is formed along the back surface of the liquid crystal panel 2 in the same manner as the rear wall portion 41 a of the lower side portion 41. Moreover, each side part 42,43,44 has the outer wall part 4b. The outer wall 4b as a whole surrounds the outer peripheral edge (the end surface (the surface defining the thickness of the liquid crystal panel 2)) of the liquid crystal panel 2 and faces the outer peripheral edge in the in-plane direction (vertical direction or horizontal direction).

  As shown in FIG. 1 or FIG. 3, elongated cushions 46 made of an elastic material are provided on the rear wall portion 41a and all the rear wall portions 4a. The cushion 46 is affixed to the surface of the rear wall portions 41a and 4a on the liquid crystal panel 2 side. The cushion 46 is located between the back surface of the liquid crystal panel 2 and the rear wall portions 4a and 41a, and prevents the liquid crystal panel 2 from directly hitting the rear wall portions 4a and 41a. Moreover, each cushion 46 exhibits the force which returns the outer peripheral part of the liquid crystal panel 2 to an original position, when the outer peripheral part of the surface of the liquid crystal panel 2 is pushed.

  As shown in FIGS. 1 and 2, the front frame 5 and the support frame 4 are attached to each other so as to sandwich the outer periphery of the liquid crystal panel 2. Each side of the front frame 5 is formed to have a substantially L-shaped cross section, and includes a front wall portion 5a and an outer wall portion 5b bent at the edge of the front wall portion 5a. The front wall portion 5 a faces the front surface (display surface) of the liquid crystal panel 2 in the thickness direction of the liquid crystal panel 2. The outer wall portion 5 b is disposed outside the outer wall portion 4 b of the support frame 4 and surrounds the outer peripheral surface of the support frame 4.

  As shown in FIG. 1, the front wall 5a on each side of the front frame 5 is also provided with an elongated cushion 51 made of an elastic material. The cushion 51 is affixed to the surface of the front wall 5a on the liquid crystal panel 2 side. The cushion 51 is located between the surface of the liquid crystal panel 2 and the front wall 5a, and prevents the liquid crystal panel 2 from directly hitting the front wall 5a.

  As shown in FIG. 1, a gap is provided between the front wall portion 5 a of the front frame 5 and the rear wall portions 4 a and 41 a of the support frame 4. The outer peripheral portion of the liquid crystal panel 2 is disposed between the rear wall portions 4a and 41a and the front wall portion 5a. The distance between the front wall portion 5 a and the rear wall portions 4 a and 41 a is larger than the thickness of the liquid crystal panel 2. That is, when the front frame 5 is attached to the support frame 4, the front wall portion 5a abuts against the support portion 41b and the outer wall portion 4b, so that the interval between the front wall portion 5a and the rear wall portions 4a and 41a is supported. It is defined by the width of the portion 41b (width in the thickness direction of the liquid crystal panel 2) and the width of the outer wall portion 4b (also in the thickness direction). The width of the support portion 41b and the outer wall portion 4b is larger than the thickness of the liquid crystal panel 2. Therefore, the distance between the front wall portion 5 a and the rear wall portions 41 a and 4 a is larger than the thickness of the liquid crystal panel 2. Thereby, even if the liquid crystal panel 2 is slightly warped, the front frame 5 can be attached to the support frame 4 without applying stress to the liquid crystal panel 2. Since the large liquid crystal panel 2 often has slight warpage, the outer peripheral portion of the liquid crystal panel 2 partially hits the front wall portion 5a or the rear wall portions 4a and 41a. As a result, rattling of the liquid crystal panel 2 with respect to the support frame 4 and the front frame 5 is suppressed.

  As described above, the lower edge 2a of the liquid crystal panel 2 is supported by the support portion 41b. The lower edge 2 a of the liquid crystal panel 2 is disposed on the upper surface of the support portion 41 b without applying a force in the thickness direction to the liquid crystal panel 2. In the present embodiment, the lower edge 2a of the liquid crystal panel 2 is attached to the upper surface of the support portion 41b. That is, the surface (lower edge 2a) facing downward of the liquid crystal panel 2 and the upper surface of the support portion 41b are attached in the vertical direction.

  In this example, an adhesive surface having a width (width in the thickness direction) larger than that of the liquid crystal panel 2 is provided on the upper surface of the support portion 41b, and the lower edge 2a of the liquid crystal panel 2 is disposed on the adhesive surface. Specifically, a thin attachment member having adhesive surfaces on both surfaces (that is, the upper surface and the lower surface) is disposed on the support portion 41b.

  Specifically, the adhesive tape 45 is disposed on the support portion 41b. An adhesive is applied to both surfaces of the adhesive tape 45, and both surfaces of the adhesive tape 45 function as adhesive surfaces. The adhesive tape 45 is affixed on the upper surface of the support part 41 b, and the lower edge 2 a of the liquid crystal panel 2 is disposed on the adhesive tape 45 and is affixed to the upper surface of the support part 41 b via the adhesive tape 45.

  The adhesive tape 45 has a width corresponding to the width of the support portion 41b. Specifically, one edge along the length direction of the adhesive tape 45 is in contact with the rear wall portion 41a. The other edge is located slightly inward from the edge of the upper surface of the support portion 41b.

  As shown in FIG. 3, the upper surface of the support portion 41 b is a horizontal surface that is elongated in the direction along the lower edge 2 a of the liquid crystal panel 2. Therefore, a wide adhesion region can be secured between the lower edge 2a of the liquid crystal panel 2 and the upper surface of the support portion 41b. Here, the adhesive tape 45 has a strip shape elongated in the direction along the lower edge 2 a of the liquid crystal panel 2.

  Further, the length of the adhesive tape 45 in this example is longer than the length of the upper surface of the support portion 41b. Therefore, one end portion of the adhesive tape 45 exceeds the support portion 41b outward in the left-right direction (right direction in FIG. 3). And the edge part of the adhesive tape 45 is affixed on the upper surface 41c lower than the upper surface of the support part 41b. As a result, the adhesive tape 45 is difficult to peel off.

  The adhesive tape 45 is formed of a material having flexibility, and due to the flexibility, displacement of the upper surface (the surface to which the lower edge 2a of the liquid crystal panel 2 is bonded) relative to the lower surface (the surface to be bonded to the support portion 41b) is allowed. Yes. That is, the position of the upper surface of the adhesive tape 45 can slightly move in the horizontal direction (specifically, the front-rear direction or the left-right direction) with respect to the lower surface. The adhesive tape 45 is a thin foam such as urethane foam, polyethylene foam, vinyl foam, styrene foam, and has both flexibility and elasticity. An adhesive is applied to both sides of the foam.

  For this reason, when the liquid crystal panel 2 is slightly deformed by heat during use of the liquid crystal display device 1, a change in the position of the lower edge 2a is allowed. As a result, the occurrence of stress in the liquid crystal panel 2 can be suppressed, and the occurrence of uneven color can be suppressed even when the liquid crystal panel 2 is slightly deformed by heat.

  In addition, since the adhesive tape 45 has elasticity, even when the liquid crystal panel 2 is pressed from the outside, the adhesive tape 45 exhibits a force for returning the position of the lower edge 2a of the liquid crystal panel 2 to the original position. .

  Note that the method of attaching the lower edge 2a of the liquid crystal panel 2 to the upper surface of the support portion 41b is not limited to that described above. For example, the lower edge 2a of the liquid crystal panel 2 may be directly attached to the upper surface of the support portion 41b with an adhesive. Further, an adhesive may be applied to the lower edge 2a of the liquid crystal panel 2 or an adhesive tape may be attached. Further, the lower edge 2a is placed on the upper surface of the support portion 41b by an adhesive or a paste-like thermosetting resin supplied to the upper surface of the support portion 41b after the lower edge 2a of the liquid crystal panel 2 is disposed on the upper surface of the support portion 41b. It may be affixed to.

  As described above, in the liquid crystal display device 1, the lower edge 2a of the liquid crystal panel 2 is attached to the upper surface of the support portion 41b.

  Therefore, even when the lowermost right end or left end of the front surface of the liquid crystal panel 2 is pressed, the lower edge 2a of the liquid crystal panel 2 is not easily displaced with respect to the upper surface of the support portion 41b. As a result, since the situation where the lower edge 2a of the liquid crystal panel 2 moves relative to the upper surface of the support portion 41b does not occur and is caught on the upper surface of the support portion 41b by the frictional force, the occurrence of uneven color on the display surface is suppressed.

  In addition, since the relative position of the liquid crystal panel 2 with respect to the support frame 4 and the front frame 5 does not change when the liquid crystal display device 1 vibrates in the process of transporting the liquid crystal display device 1, impact applied to the liquid crystal panel 2 can be reduced. As a result, the durability of the liquid crystal display device 1 can be improved.

  Furthermore, when the liquid crystal panel 2 is warped, the position of the lower edge 2a on the upper surface of the support portion 41b changes depending on the degree of warpage. Since the lower edge 2a is affixed to the upper surface of the support portion 41b, the lower edge 2a can be fixed at a position corresponding to the warp of the liquid crystal panel 2.

  The present invention is not limited to the liquid crystal display device 1 described above, and various modifications can be made.

  For example, the lower edge 2a of the liquid crystal panel 2 is not directly bonded to the support portion 41b, but may be disposed on an attachment member having a flexible elastic body and an adhesive surface attached to the upper surface of the support portion 41b. Good. FIG. 4 is a cross-sectional view of the liquid crystal display device according to this embodiment. In the figure, the same reference numerals are assigned to the same portions as described above.

  In FIG. 4, the lower edge 2 a of the liquid crystal panel 2 is disposed on a mounting member 145 including a foam (elastic body) such as a low-resilience urethane foam that is thicker than the foam of the adhesive tape 45. The attachment member 145 has, for example, a shape equivalent to the above-described adhesive tape 45 in plan view, and has a thickness larger than that of the adhesive tape 45. In the mounting member 145, an adhesive is applied only to one side (the lower surface (bonding surface)), and the one surface is stuck to the support portion 41b. The foam of the mounting member 145 has flexibility and elasticity in the thickness direction. Therefore, the liquid crystal panel 2 is disposed so as to sink into the mounting member 145 due to its own weight, and the foam 145a inserted between the liquid crystal panel 2 and the front wall portion 5a, The liquid crystal panel 2 is sandwiched by the foam 145b that has entered between the rear walls 41a, thereby restricting the movement of the liquid crystal panel 2 and temporarily applying external pressure to the liquid crystal panel 2. However, the liquid crystal panel 2 can be returned to the original position by the restoring force of the foam.

  In the liquid crystal display device 1 described above, the adhesive tape 45 is formed of a foam having flexibility and elasticity. However, the adhesive tape 45 may be formed of a relatively hard material such as polyethylene terephthalate.

  In the above description, the support portions 41 b of the support frame 4 are provided at both ends of the lower side portion 41. However, the position of the support portion 41b is not limited to this. For example, the support portion 41b may be provided at a position closer to the center than the end portion.

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device, 2 Liquid crystal panel, 2a Lower edge, 3 Backlight unit, 4 Support frame, 4a Rear wall part, 4b Outer wall part, 5 Front frame, 5a Front wall part, 5b Outer wall part, 21 Substrate, 22 Liquid crystal, 23 Polarizing filter, 31 Reflective sheet, 32 Diffuser plate, 33 Optical sheet, 34 Lower frame, 41 Lower side part, 41a Rear wall part, 41b Support part, 42 Upper side part, 43 Right side part, 44 Left side part, 45 Adhesive tape, 46 Cushion, 51 Cushion, 145 Mounting member.

Claims (5)

LCD panel,
A frame surrounding an edge of the liquid crystal panel,
The lower side portion of the frame includes a support portion on which the lower edge of the liquid crystal panel is placed,
The support part has a width larger than the thickness of the liquid crystal panel,
The lower edge of the liquid crystal panel is affixed to the upper surface of the support portion;
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1.
An adhesive surface is provided on the upper surface of the support portion, and the lower edge of the liquid crystal panel is disposed on the adhesive surface.
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 2,
The frame has a plurality of support portions positioned apart from each other in the direction along the lower edge of the liquid crystal panel as the support portion,
The adhesive surface is provided on each of the plurality of support portions,
A liquid crystal display device characterized by the above. The liquid crystal display device according to claim 1.
The lower edge of the liquid crystal panel is attached to the upper surface of the support part via an attachment member disposed on the support part,
The attachment member has a first surface that adheres to the liquid crystal panel and a second surface that adheres to the support portion, and the first member is interposed between the first surface and the second surface. Having a flexible material that allows a positional deviation between the second surface and the second surface,
A liquid crystal display device characterized by the above. LCD panel,
A frame surrounding an edge of the liquid crystal panel,
The lower side portion of the frame includes a support portion that supports a lower edge of the liquid crystal panel,
The support part has a width larger than the thickness of the liquid crystal panel,
The lower edge of the liquid crystal panel via the arranged mounting member on said support portion is disposed on the upper surface of the support portion,
It said mounting member includes a resilient member having flexibility, an adhesive surface to be bonded to the support portion,
The liquid crystal panel is disposed so as to sink into the mounting member.
A liquid crystal display device characterized by the above.

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